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49 Cards in this Set
- Front
- Back
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Char of Gymnospersm
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-ovules and seeds naked
-no flowers -female gametophyte produces many achegonia -many eggs fert but only one embryo develops in each seed -male gametophyte encased in pollin grain |
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Megasporangium in Gymnospores also called a...
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nucellus
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Surrounding tissue of a gymnospore ovule are...(2)
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nucellus, integuments
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Micropyle is...
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opening for a pollen tube:
(gymnosperms?) |
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food supply for gymnosperm seed in development is...
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female gametophyte tissue
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Char of coniferophyta
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-most widespread
-adapted to dry/cool climates -tallest -generally evergreen |
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Pine reproduction
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-2 years
-micro/mega spores produced in sep cones on same tree: monoecious |
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Monoecious
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micro/mega spores produced on same tree
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Diff between one and two year female cones
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one year: more open
two years: closed |
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How long does it take for a megaspore to develop into a megagametophyte
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15 months
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Char of Gymnospersm
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-ovules and seeds naked
-no flowers -female gametophyte produces many achegonia -many eggs fert but only one embryo develops in each seed -male gametophyte encased in pollin grain |
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Megasporangium in Gymnospores also called a...
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nucellus
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Surrounding tissue of a gymnospore ovule are...(2)
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nucellus, integuments
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Micropyle is...
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opening for a pollen tube:
(gymnosperms?) |
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food supply for gymnosperm seed in development is...
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female gametophyte tissue
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Char of coniferophyta
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-most widespread
-adapted to dry/cool climates -tallest -generally evergreen |
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Pine reproduction
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-2 years
-micro/mega spores produced in sep cones on same tree: monoecious |
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Monoecious
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micro/mega spores produced on same tree
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Diff between one and two year female cones
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one year: more open
two years: closed |
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How long does it take for a megaspore to develop into a megagametophyte
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15 months
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Female gametophyte of a conifer has how many archegonia and what do they do
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two to three
-they produce egg cells |
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Where are microspores of pines produced on and where do they develop on?
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produced on microsporangiate cone and develop on microsporophylls
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Micro and mega spore mother cells each produce how many spores? (conifers)
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four
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Each microspore becomes....(conifers)
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-2 prothalial cells
-generative cell: divides to form 2 sperm eventually -tube cell -by mitosis -this is a pollin grain |
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When and what happens in pollination of coniferophytes
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spring
-scales open to let in pollin -then scales grow together to protect ovules -very long delay before fert |
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What happens in fert of Conifers
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-pollin tube grows toward megagametophyte
-generative cell divides to form 2 sperm -both sperm discharged, one unites with egg, other degenerates |
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How many eggs are fert and howmany eggs develop in conifers
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All are fertilized but only one develops
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cycadophyta are...
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-palm-like tropical plants
-highly toxic -dioecoius -multiflaggelated sperm |
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Dioecious means
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pollen and ovulate cones on different plants
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Ginkgophyta are...
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-deciduous
-dioecious -flagellated sperm -herbal remedy |
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Gnetophyta are...
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-3 genera
-most closely related to angiosperms -mostly dioecious -nonmotile sperm |
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Ephedra is
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-a gnetophyte
-branched, small scale like leaves -mormon tea -arid regions |
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Welwitschia is
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-a gnetophyte
-two strap shaped leaves -desert -weird |
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two phyla of seedless vascular plants...
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lycopodiophytes: club mosses
pteridophytes: whisk ferns, horsetails, ferns |
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Lycophytes are...
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-club mosses
Have..microphylls, roots are evergreen |
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Microphylls are...
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simple leaves with single strand of vascular tissue
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homosporous plants form....
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one kind of spore that forms biosexual gametes
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heterosporous plants form...
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two unisexual gametophytes
-sporophyte--> megaspore and microspore-->female and male gametophyte to make egg and sperm` |
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an example of heterosporous plants...
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Selanginella
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strobilis are...
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contain reproductive structures called cones
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What types of phylls are in the pteridophyta genus'
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True Ferns: megaphylls
Psilotum: no true leaves Equisetum: microphylls |
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All pteridophytas are homosporous or heterosporous
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homosporous
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The dominant generation in lycopods are...
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sporophyte
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The dominant generation in pteridophytes are...
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sporophyte
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The dominant generation in nonvascular plants are...
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gametophyte
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Megaphylls are...
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larger more complex branching veins present in true ferns (pteridophyta)
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The pteridophyte that is not photosynthetic is....
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Psilotum
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Sori are present in.... and are....
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present in true ferns and are clusters of sporangia
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Horsetails are....
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Equisetum pteridophyta
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